Echidna - エキドナ

Echidna is one of the Witches of Sin, being the Witch of Greed. She has a strong thirst for knowledge along with a curiosity for the unknown, which defines her behavior. Echidna is described as black hearted, being unable to empathize with others and their feelings due to a lack of understanding. She will do anything to gain knowledge, be it deceit or employed sophistry.